I know this is an old thread which stayed my hand for a bit, but yes, I agree with above.
At this point SC is so far back in most young horse pedigrees - at least grandfather. However, I will say that SC has, somehow, the best influence (IME) coming through tail male as a grandsire/gg. For whatever reason, he seems to really improve bone and movement. Some of his sons (and GGs) have also passed on very good movement. He is definitely, in my eyes, a stallion that is good to have on paper.
Some of the best moving race-bred TBs I have seen to date have been tail male to SC. And they can all jump out of their skin. I have never met an unathletic SC son. Only met a few unathletic SC grandsons.
I think the reputation of them being difficult is unfair. They do not suffer fools, and that’s where I think that someone who picks up an OTTB fresh off the track might get into trouble. They really do not tolerate unfair handling, and are sensitive (perceptive) - SC has proliferated just about every page there is, so when newer owners get a TB there’s a good chance that it has SC in it… and since SC is the only name recognizable to these people on paper, he is unfairly assigned the bulk of the blame when, IMHO, it has much more to do with the horse’s management, handling, and knowledge/experience of the handler over the true disposition of the horse.
My experience with his direct progeny that have flunked the track and trickled into sport homes is that they are sensitive in a good way, easily trained, light on their feet, and superbly catty. Not always the most brilliant movers, and some of them can be quite small. Most of them are long in the tooth now and good citizens.
My experience with his grandget is that by and large they seem to be very clever, but still maintain that sensitivity (when I say sensitivity I am not talking “high strung”, I’m talking they are very perceptive). Most you can ride an XC course on the buckle once you retrain them, they are that sensitive to your seat and aids. They are usually very big of frame, good movers (especially through studs like Black Minnaloushe, Frost Giant, Giant’s Causeway, Johannesburg, etc), and of course, have jumping ability in spades. I do not find them any more difficult than any other horse, personally.